The third plenary session of the 20th CPC Central Committee fully reflects the historical initiative of the Party to further comprehensively deepening reform centering on the advancement of Chinese modernization, embodying the internal unity of reform approach and its ultimate purpose. This endeavor requires grasping the historical trend to clarify the inevitability and direction of reform, following historical laws to enhance its scientific and systematic nature of reform, summarizing historical experience to enhance its stability and innovativeness, and strengthening the historical mission to uphold the responsibility and people-oriented nature of reform. Examining the theoretical and practical pathways of further comprehensively deepening reform from the perspective of historical initiative will contribute to a deeper understanding of the intrinsic connection between reform and Chinese modernization, thereby strengthening our historical confidence and initiative in promoting deepening reform comprehensively in the context of Chinese modernization.